Mr Stone was going away --41-- a week.Before he left,he said

Mr Stone was going away __41__ a week.Before he left,he said to his son,“ If anyone asks for me,you can say that your father __42__ out for doing something,and will be back in a week,then be sure to ask him to sit down for a cup of tea.”
His son nodded.But he was afraid his son might forget this,so he wrote these words down on a piece of paper and gave it to his son.His son put it into his small pocket,and took it out to look at every word __43__.
Four days passed __44__ anyone coming to __45__ his father.Thinking that there was no man coming and he had no more use for that piece of paper,the boy burnt it away on that night.
On the __46__ day in the afternoon,someone knocked __47__ the door.The boy opened it.A man was standing at the door and said,“Where is your father?” The boy quickly put his hand __48__ his pocket and looked __49__ the piece of paper.As he could not find it,he suddenly remembered and shouted,“No more.”
The man was greatly surprised.He asked,“No more?I __50__ your father last week.When did it happen?”
“Burnt last night.”
41.A.in B.for C.at D.on
42.A.have gone B.has gone C.have gone D.has been
43.A.now B.now and then C.then D.then now
44.A.without B.with C.hasn’t D.haven’t
45.A.look B.look at C.see D.watch
46.A.that B.this C.five D.fifth
47.A.in B.at C.of D.for
48.A.into B.in C.at D.up
49.A.after B.for C.like D.at
50.A.met B.meet C.would meet D.have met